[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] frontend and backend
> Hi, I am reading frontend and backend block drivers. I find the frontend > and the backend are matched magicly by xend. Is there any way for the > frontend to choose a backend by itself? I am trying to provide a new pair > of frontend and backend drivers. How can I let xend know they should match > each other? I can assign them a different pair of IDs in > domain_controller.h, of course. If you want the frontend itself to be able to choose, you should add a domid field into one of the frontend's control messages, then write appropriate code in Xend that will parse this message and notify the correct backend. This is what I have done for XenFS. > Another question is about the function virt_to_machine. Does it convert > linear address to machine address? Is the machine address here the same as > physical memory address? If not, when a page is used as a shared ring, why > the machine address is sent, instead of the physical address? Virtual addresses == what the application sees (as per normal) (Pseudo)physical addresses == what most of the guest kernel regards as physical memory. It provides the illusion of a contiguous physical memory. These don't have much meaning outside the domain. Machine addresses == The actual address in the machine's memory, suitable for inserting into page tables and for passing to other domains so they can map your memory. HTH, Mark > -------------------------- > Zhiyi from EPFL Switzerland > > > > ------------------------------------------------------- > SF email is sponsored by - The IT Product Guide > Read honest & candid reviews on hundreds of IT Products from real users. > Discover which products truly live up to the hype. Start reading now. > http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click > _______________________________________________ > Xen-devel mailing list > Xen-devel@xxxxxxxxxxxxxxxxxxxxx > https://lists.sourceforge.net/lists/listinfo/xen-devel ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/xen-devel
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